variation of species

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• Species richness — is the number of species in a given area. It is represented in equation form as S.Typically, species richness is used in conservation studies to determine the sensitivity of ecosystems and their resident species. The actual number of species… …   Wikipedia

• Variation and Evolution in Plants — written by G. Ledyard Stebbins. was published in 1950; it is one of the key publications embodying the modern evolutionary synthesis, as the first comprehensive publication to discuss the relationship between genetics and natural selection in pl …   Wikipedia

• Variation — means a change within population* Biodiversity * Genetic diversity, differences within a speciesPhysics: * Magnetic variation, difference between magnetic north and true north, measured as an angle * Variation (astronomy), any perturbation of the …   Wikipedia

• Species evenness — is a diversity index, a measure of biodiversity which quantifies how equal the community are numerically. So if there are 40 foxes, and 1000 dogs, the community is not very even. But if there are 40 foxes and 42 dogs, the community is quite even …   Wikipedia

• Species — In biology, a species is one of the basic units of biological classification and a taxonomic rank. A species is often defined as a group of organisms capable of interbreeding and producing fertile offspring. While in many cases this definition is …   Wikipedia

• Species of Allosaurus — There have been a number of potential species assigned to the carnosaurian dinosaur genus Allosaurus since its description in 1877 by Othniel Charles Marsh, but only a handful are still regarded as valid. Allosaurus was originally described from… …   Wikipedia

• variation — variational, variative /vair ee ay tiv/, adj. variationally, variatively, adv. /vair ee ay sheuhn/, n. 1. the act, process, or accident of varying in condition, character, or degree: Prices are subject to variation. 2. an instance of this: There… …   Universalium

• variation — noun ADJECTIVE ▪ considerable, dramatic, enormous, extreme, great, major, marked, significant, substantial, tremendous, wide …   Collocations dictionary

• variation —    by Jonathan Roffe   Deleuze mobilises the concept of variation in order to insist on what is perhaps his most fundamental theme, that existence is not characterised primarily by unities, but rather by a continual sense of movement and change.… …   The Deleuze dictionary

• variation —    by Jonathan Roffe   Deleuze mobilises the concept of variation in order to insist on what is perhaps his most fundamental theme, that existence is not characterised primarily by unities, but rather by a continual sense of movement and change.… …   The Deleuze dictionary

• Species of Psittacosaurus — Seventeen species have been assigned to the extinct ceratopsian dinosaur genus Psittacosaurus , although only nine to eleven are considered valid.Xu Xing Zhao Xijin. (1999). Psittacosaur fossils and their stratigraphical implications. In: Wang Y …   Wikipedia